Apparatus for making of photographic contact copies of documents



w. GANLEY 2,252,562

APPARATUS FOR MAKING OF PHOTOGRAPHIC CONTACT COPIES OF DOCUMENTS Aug. 12, 1941.

Filed July 24, 1940 III was

IN VENT OR.

parts throughout the entire specification.

Patented Aug. 12, 1941 APPARATUS FOR MAKING- OF PHOTO.

"GRAPHIC CONTACT MENTS COMES OF DOCU- William Ganley, New York, N. Y. Application July 24, 1940,'Serial No. 347.183

4 Claims.

My invention relates to that class of devices designed to provide quick and simple means to produce copies of printed or written documents.

In devices of that character with which I am' familiar it is found dlilicult to obtain clear prints of the matter the extreme edges of the page which is being reproduced. Also in making the prints. sheets of sensitized paper must be used. This limits to a considerable extent the usefulness of the device.

invention has for its principal object to provide means which will greatly improve the elfectiveness of the device by increasing the clear--. ness of the print and producing a print which will he as clear and distinct at its edges as in. the center.

A further object isto do away with the necessity of employing a fluorescent screen.

A further object is to provide a self-contained device having a continuous roll of sensitized paper v therein, so that the number of copies which can be made is only limited by the length of paper in the roll. 4

My means of accomplishing the foregoing objects may be more readily understood by having reference to'the accompanying drawing which is hereunto annexed and made a part of this specification in which:

Fig. 1 is a vertical sectional view of a device embodying my improvern t.

Fig. 2 is a section on the line 2-4 in Fig. 1.

Fig. 3 is a top or plan view with the glass plate removed in Fig. 1.

Fig. 4 is an enlarged detail view of the roll of sensitized paper showingits mounting.

Fig. 5 is a detail view in section of my improved plate.

Fig. 6 is a cross-section of a lamp equipped with means to obviate the necessity of using a fluorescent plate.

Similar reference numerals refer to simila.

As shown in the drawing, I provide a container of sensitized paper. Bearings or box having top, bottom,. end, and side walls I, 5

2, 3, l and 5 respectively. The top wall I, is preferably secured to the end wall 3, by means of a hinge 8. Below the top wall I mount a. plate of transparentglass l, the lower surface of which is given a coating of green zinc sulfide 8 (ZnSl-hO) produced by adding copper sulfate (CuS04.5HzO). to the zinc sulfide. The upper surface is coated with a. canary yellow zinc sulfide I, which is produced by adding cadmium sulfide (CdS) and chloride (C.Cl). Below this plate 1, 4

are mounted one or more electric light bulbs or tubes ill. In practice I have found those known to the trade as Lumaline tubes, although the ordinary incandescent light bulb properly distributed within the container will give the same results. Therefore, the terms bulbs or tubes" where used. in my description are synonymous. These tubes are connected by means of electric wires El and iii, to a source of electric current (not shown). An'automatic switch l3, may be utilised if desirecL'the switch It may be set for the correct amount of time required for the exposure.

At one end of the container I construct a light tightv chamber it, in which is mounted a roll l5, l6 and H, for the roll l5, are secured to the side walls 4 and 5, in any suitable or convenient manner. A slot I8. is cut in the wall IQ, of the chamber N; through which the sensitized paper may be drawn over the glass plate I. The upper edge 20, of the slot I8, is preferably provided with a; knife edge by means of which the operator may tear or cut oil? the desired length of paper for the print to be made.

The top wall H, of the chamber should be either hinged as shown or made easily removable, so as to permit easy access to the chamber for the purpose of: loading the roll I 5, in place.

I have found in practice that a highly satisfactory print can be made by using the glass plate, formed of diflusing glass instead of transparent and then coating the electric light bulbs or tubes Ill, as seen in the detail view Fig. 6, with green or yellow zincsulfide, and arranging the tubes alternately one green, one yellow across the entire container as shown in Figure 3.

-When this is done a very even print is produced.

" Operation The operation oi. the device is as follows: The

top wall 2!, of the chamber H, is opened and a.

held tightly against the document and paper is then placed on top of them, the switch is thrown connecting the electric light tubes III,

to the source of electric current (not shown). The light emitted by the tubes III, will be absorbed by the activation of the fluorescent material on either the tubes ill, or the glass plate '1.

After the exposure has been made for a few seconds the electric current is automatically turned off. The sensitized paper 15, is dipped into a solution of MQ forming a negative. It can then be put into a fixing solution and the negative will be made light-proof. Afterwards as many positive copies may be made as required.

Although I have described with more or less particularity specific details of construction, I do not wish to be understood as intending to be limited thereby, since they are merely to illustrate a concrete embodiment of my invention, as changes in the details may be made in commercial production. Therefore I do not desire to be limited to the exact disclosure except where such limitations appear in the hereinafter appended claims.

Having described my invention What I regard as new and desire to secure by Letters Patent is:

1. In a device of the character described to reproduce printed or other material on sensiti'zed paper; a container having top, bottom, end, and side walls, a difiusing plate of glass therein, a coating on one side of said plate of green zinc sulfide, a coating on the other side of yellow zinc sulfide, an electric light source in said container below said plate, and means to connect current to said light source.

2. In a device of the character described to reproduce printed or other material on sensitized paper a container having top, bottom, end, and side walls, a light-proof chamber at one end of said container, means to detachably mount a roll of sensitized paper in said chamher, there being a slot'in the wall adjacent the top 0! the container through which the sensitized paper may be drawn, the upper edge of said slot having a knife edge whereby the paper may be cut off in desired lengths, a plate of transparent glass therein, a coating on one side of said plate of greemzinc sulfide, a coating on the other side of yellow zinc sulfide, an electric light source in said container below said plate, and means to convey current to said light source.

3. In a device of the character described to reproduce printed or other material on sensitized paper; a container having top, bottom, end, and side walls, a transparent plate oi glass therein, a coating on one side of said plate of green zinc sulfide, a coating on the other side of yellow zinc sulfide, an electric light source in said container below said plate, means to connect current to said light source, and means to hold the material to be reproduced tightly against said sensitized paper on said glass plate. 4. In a device of the character described to reproduce printed or other material on sensitized paper; a container having top, bottom, end, and side walls, a plate of material which will transmit light rays having one side treated with a phosphorescent emulsion of green color for storing light for a period of time and then emitting it, the other side,of said plate being coated with a .-Emilar emulsion of yellow color, an electric light source in said container below said plate, and means to connect current to said light source.

WILLIAM GANIEY. 

